JPS63167650A - Winding type rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the mechanical unbalance amount of a winding type rotary electric machine and to shorten the crossover track between coil groups by suitably setting the number of the connecting circuits of the winding with respect to the number of the poles of a rotor, and substantially equally arranging the connecting sections between the phases of the windings in a circumferential direction. CONSTITUTION:The number of the connecting circuits of U-phase coils U1-U6, V-phase coils V1-V6 and W-phase coils W1-W6 are set to np/2 (where n is natural number) with respect to the number (p) of the poles of a winding. Coil groups are commonly connected in a star type to form interphase connecting sections N1, N2, N3. The sections N1-N3 are arranged substantially at an interval of 120 deg. in a circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a wound rotary electric machine having a winding on a rotor.

(Prior Art) In this type of rotating electrical machine, for example, an induction motor having a six-pole secondary winding, the number of connections of the secondary winding is 1 or 2.
It was common to do so. As a conventional connection example, 1×
FIG. 3 shows the case of Y connection, and FIG. 4 shows the case of 2XY connection. Ul-U6, V circled in both figures
Each symbol of l-VB, Wl to W8 represents U phase,
The V-phase and W-phase windings are shown, and together constitute six poles.

Now, in Figure 3, which shows the 1xY connection, terminal X.

Y and z are commonly connected to serve as a neutral point, and the interphase connection N
are concentrated in one place. In general, stator windings that do not rotate do not need to be mechanically balanced, but rotor windings require strict correction of unbalance by increasing or decreasing the rotor because the entire rotor rotates. Must be done. However, when the number of connected circuits is 1, the third
As shown in the figure, it is inevitable that the interphase connection portions N are unevenly distributed in one place. For this reason, there is a drawback that the amount of unbalance of the entire rotor increases, requiring much effort to correct the balance, and that a large space must be secured for the correction. In addition, if the interphase connections N are unevenly located in one place, the crossover wires for connecting each coil group will become long.
There is also the drawback that shaping the coil end takes a lot of effort, and the dimensions of the coil end including the interphase connection portion N become large.

On the other hand, in the 2XY connection shown in Fig. 4, terminals X1-Yl-
zl and terminals X2-Y2-zl are connected to the neutral point respectively.
Interphase connection portions Nl and N2 are present at certain locations. However, even in this case, the connection part N1 between ten points. Since N2 exists only in two symmetrical positions, the amount of mechanical unbalance increases, similar to the 1×Y connection in Figure 3, and the effort of balance repair cannot be sufficiently reduced. Furthermore, there remains the problem that the length of the crossover wire cannot be made sufficiently short.

(Problems to be Solved by the Invention) As mentioned above, in conventional wound rotary electric machines, the number of connected circuits is small, so mechanical imbalance becomes large, requiring a lot of effort to correct the balance. This had the disadvantage that the connecting wires for connecting each coil group were long.

Therefore, the zero objective of the present invention is to provide a wound rotary electric machine that can reduce the amount of mechanical unbalance as much as possible, reduce the labor of unbalance correction, and further reduce the overall size by shortening the crossover wires as much as possible. It is on offer.

[Structure of the Invention] (Means for Solving the Problems) A wound rotary electric machine of the present invention has a winding provided on a rotor with a number of connected circuits of 3 or more, n p / 2 (p is a winding). The number of poles of the wire (n is a natural number) is determined, and the interphase connection portions are arranged approximately equally in the circumferential direction.

(Function) Since the number of connected circuits of the rotor windings is 3 or more (np/2) and the interphase connections are distributed over the entire circumference, the amount of mechanical unbalance is reduced and the number of connections between the coils is The crossover wire dimensions become shorter.

(Example) A first example in which the present invention is applied to a six-pole wound three-phase induction motor will be described below with reference to FIG. In the drawing, U
l -U8, Vl -VB, Wl ~ W6 are
Similarly to the conventional example, U-phase, V-phase, and W-phase coil groups are shown. For example, in the U phase, each coil group of Ul, U2, U3
．． Each coil group U4 and each coil group U5 and U6 are connected in series to form three parallel circuits, and similarly three parallel circuits are formed for each of the other phases. And U2. V2. W2 (7) Each coil group is commonly connected in a star shape at terminals X1+Yl and Zl to form an interphase connection part N1, and U4. V4. The respective coil groups of U8. Vl
3. The coil groups of We are also commonly connected in a star shape at terminals X3*Y3+Z3 to form an interphase connection N3. Therefore, the number of connected circuits of the winding is n-1,
It is 3, which corresponds to (n p / 2) when p = 6 [poles], and the connection between each phase Nl, N2 +
N3 is equally distributed at approximately 120° intervals in the circumferential direction.

] According to the second configuration, since the interphase connection portions N1 to N3 are equally spaced in three directions in the circumferential direction, there are fewer mechanically unbalanced parts, and the effort required for balance correction is reduced accordingly.
In addition, less space is required for the increase method or subtraction method required for balance correction.

In addition, as a terminal treatment method for the interphase connections N1 to N3, if a tube or the like is attached to the connection part and the direction of binding to the coil end is unified, the amount of mechanical unbalance can be further reduced. . Moreover, as is clear from a comparison with Figures 3 and 4, which show conventional examples, the dimensions of the crossover wires for connecting each coil group are shortened, and the dimensions of the coil end including the connection part are shortened. As a result, the entire rotor can be made smaller.

FIG. 2 shows a second embodiment of the present invention, in which n in (np/2) is set to 2 in a six-pole configuration.

Therefore, the number of connected circuits of the winding is 6, making it a 6XY connection, and the terminals XI -Yl-Zl, X2 Yt
Z2 s X3 -Y3 -Z3 Island x, -y
, -Z4sx, -YS-Z, and x6-Y6-Z6 are connected at the neutral point to form six interphase connection parts N1 to N6. These interphase connection portions N1 to N6 are equally spaced at angular intervals of approximately 60° with respect to the circumferential direction. Even with this configuration, it goes without saying that the same effects as in the first embodiment can be achieved.

In each of the above-mentioned embodiments, an example is shown in which the phase-to-phase connection is made by star connection, but the present invention is not limited to this, and it goes without saying that the phase-to-phase connection may be made by delta connection. In addition, the present invention is not limited to the above embodiments, and can be implemented with various modifications without departing from the scope of the invention.

[Effects of the Invention] As described above, the present invention sets the number of connected circuits of the rotor winding to np/2 (n is a natural number, p is the number of poles) and arranges the interphase connection portions approximately equally in the circumferential direction. It is characterized by the fact that mechanical imbalances can be minimized and the effort required to correct the balance can be minimized.Furthermore, the dimensions of the crossover wires for connecting between coil groups can be shortened. This has the excellent effect of facilitating the shaping of the end and reducing the overall size.

[Brief explanation of the drawing]

Fig. 1 is a winding connection diagram showing the first embodiment of the present invention when nml is used, and Fig. 2 is a winding connection diagram showing the second embodiment when nm2 is used in the present invention.
A winding connection diagram showing an embodiment, and FIGS. 3 and 4 are winding connection diagrams showing a conventional example. In the drawings, Ul to UB are U-phase coil groups, Vl-V6 are V-phase coil groups, Wl-W6 are W-phase coil groups, and N1 to NB
is the interphase connection. Applicant Toshiba Corporation Figure 1 Figure 2

Claims (1)

[Claims] 1. In a wound rotary electric machine in which the rotor is provided with a p-pole winding, the number of connected circuits of the winding is 3 or more, and np/2
(n is a natural number), and the interphase connection portions of the windings are arranged approximately equally in the circumferential direction.